"Patch" feed 1700MHz for prime focus dish with F/D = 0.3 - 0.5

Was based on the design of the patch G3RUH. The feed polarization is LHCP, so that the antenna becomes RHCP when the patch is mounted as a feed for a dish. Recalculation was made for the center frequency 1700 MHz. It was made several variants before got the best results.

Specification

Frequency

1662 - 1751 MHz

SWR

<1.5:1

Polarisation

LHCP

Gain

8.5 db

-3db beamwidth

85 deg.

-10 db beamwidth

125 deg.

Suitable dish F/D

0.3 - 0.5

Overall diameter

160 mm

Depth

22 mm

Impedance

50 ohm

Connector

N-male

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Tests using an analyzer R&S FSL6 and a reflectometer.

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The results of measurements return loss in 1700 Mhz:

The band at 1.5 VSWR:

Full span panorama:

The simple programm to conversion between VSWR-Return loss available here.